What causes the movement of electrons in horizontal and vertical directions when current is applied to the cathode of a picture tube?

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Question:What causes the movement of electrons in horizontal and vertical directions when current is applied to the cathode of a picture tube?

1.Magnetic and electric field

2.Transmission field

3.Magnetic field

4.Electric field

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  1. What causes the movement of electrons in horizontal and vertical directions when current is applied to the cathode of a picture tube?
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